vcl/source/bitmap/BitmapSolarizeFilter.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  */
  10
  11 #include <vcl/bitmap/BitmapSolarizeFilter.hxx>
  12 #include <vcl/BitmapWriteAccess.hxx>
  13
  14 BitmapEx BitmapSolarizeFilter::execute(BitmapEx const& rBitmapEx) const
  15 {
  16     Bitmap aBitmap(rBitmapEx.GetBitmap());
  17     bool bRet = false;
  18     BitmapScopedWriteAccess pWriteAcc(aBitmap);
  19
  20     if (pWriteAcc)
  21     {
  22         if (pWriteAcc->HasPalette())
  23         {
  24             const BitmapPalette& rPal = pWriteAcc->GetPalette();
  25
  26             for (sal_uInt16 i = 0, nCount = rPal.GetEntryCount(); i < nCount; i++)
  27             {
  28                 if (rPal[i].GetLuminance() >= mcSolarGreyThreshold)
  29                 {
  30                     BitmapColor aCol(rPal[i]);
  31                     aCol.Invert();
  32                     pWriteAcc->SetPaletteColor(i, aCol);
  33                 }
  34             }
  35         }
  36         else
  37         {
  38             BitmapColor aCol;
  39             const sal_Int32 nWidth = pWriteAcc->Width();
  40             const sal_Int32 nHeight = pWriteAcc->Height();
  41
  42             for (sal_Int32 nY = 0; nY < nHeight; nY++)
  43             {
  44                 Scanline pScanline = pWriteAcc->GetScanline(nY);
  45                 for (sal_Int32 nX = 0; nX < nWidth; nX++)
  46                 {
  47                     aCol = pWriteAcc->GetPixelFromData(pScanline, nX);
  48
  49                     if (aCol.GetLuminance() >= mcSolarGreyThreshold)
  50                     {
  51                         aCol.Invert();
  52                         pWriteAcc->SetPixelOnData(pScanline, nX, aCol);
  53                     }
  54                 }
  55             }
  56         }
  57
  58         pWriteAcc.reset();
  59         bRet = true;
  60     }
  61
  62     if (bRet)
  63         return BitmapEx(aBitmap);
  64
  65     return BitmapEx();
  66 }
  67
  68 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */